[Why]
Similar to SST branch, gpio conflict also needs to be avoided on
MST. Without doing so, there is a chance that gpio conflict will
occur if multiple gpio interrupts arrive simultaneously.
[How]
By mutex locking/unlocking &aconnector->hpd_lock,
we won't get gpio conflict when handling hpd.
Signed-off-by: Zhan Liu <zhan.liu@amd.com>
Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Acked-by: Zhan Liu <zhan.liu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
* conflict, after implement i2c helper, this mutex should be
* retired.
*/
- if (dc_link->type != dc_connection_mst_branch)
- mutex_lock(&aconnector->hpd_lock);
+ mutex_lock(&aconnector->hpd_lock);
read_hpd_rx_irq_data(dc_link, &hpd_irq_data);
}
#endif
- if (dc_link->type != dc_connection_mst_branch) {
+ if (dc_link->type != dc_connection_mst_branch)
drm_dp_cec_irq(&aconnector->dm_dp_aux.aux);
- mutex_unlock(&aconnector->hpd_lock);
- }
+
+ mutex_unlock(&aconnector->hpd_lock);
}
static void register_hpd_handlers(struct amdgpu_device *adev)